Bump typescript from 3.9.9 to 4.2.3

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.9.9 to 4.2.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -35,7 +35,7 @@
         "codecov": "^3.7.0",
         "get-stream": "^5.1.0",
         "node-fetch": "^2.6.0",
-        "typescript": "^3.9.5",
+        "typescript": "^4.2.3",
         "xo": "^0.32.0"
     },
     "xo": {